Method of enhancing rust-resisting qualities of iron



1T0 Drawing.

GEORGE H. GHARLS,

OF CANTON, OHIO.

METHOD OF ENHANCING RUST-RESISTING QUALITIES OF IRON.

" practical and reliable art for achieving the above result. Another object is to provide an art of the above nature which may be readily carried on at low cost. Other objects will be in part obvious and in party pointed out hereinafter.

The invention accordingly consists in the features of the art hereinafter illustratively described and as set forth in the following claims.

Incarrying on 171115 process the non is placed in molten form; and it may here be noted that the termsfiron is broadly used even though it might contain a small amount of carbon and thus include what might more-literally be termed steel. It is-also to be noted that with-the iron may be included such elements as sulfur and phosphorus in small quantities which are commonly found in commercial iron.'

' To the iron in this molten form is added a small amount of molybdenum which may be in the form of molten ferro-molybdenum.

- adapted for rollinginto sheets.

This may be added in the furnace, ladle, or:-

even in the ingot, and permeates the entire mass.

It is to be noted that the amount of molyb denum added is small, preferably notv ex- Specificatlon of Letters Patent.

Patented 0am, 1920.

Application filed April 7, 1920. Serial No. 371,882.

carbon at a low value, the resultant metal 1s given 1n a marked degree the ability-to resist rust Without heat treatment or treat-' ment of its surface. The addition of the molybdenum, moreover, in small quantities, is of value even with the iron Without carbon present; excellent results having been found in this method of treatment ofmetal from which the carbon has been entirely eliminated.

As certain variations might be made in the above. art, it is tobe understood that the matter herein set forth is in certain respects illustrative.

I claim as my invention 1. The herein described art of enhancing the rust-resisting qualities of iron which consists in adding thereto with the metal in molten form, amount of molybdenum less than one per cent.

2. vThe herein described art of enhancing the rust-resisting qualities of iron which consists in adding thereto with the metal in molten form, a small amount of molybdenum, and keeping the carbon content below 20%.

3. The herein described art of enhancing the rust-resisting qualities of iron which consists in preparin a small amount of molten. metal containlng molybdenum, preparing iron in molten form with the carbon below 20%, adding the molybdenum-containing metal to the iron, and permitting the resultant alloy to cool.

' 4. The herein described art of enhancing the rust-resisting qualities of iron which I consists in preparing a small amount of molten metal containing molybdenum,'pre-.

paring iron in molten form with the carbon ceeding'.50%, and forbestresults being in below 20%, adding the molybdenum-conthe neighborhood of .15% or even lower f The molybdenum however should not be less than the sulfur content. Also' the carbon should be maintained low, and if it is present in the molten iron to an amount exceeding 20%,it s ould be reduced. The resultant compoun should for best results contain not more than .10% of carbon.

When the ingot has solidified, it is formed into the' desired shape, being especially 7 By this addition of a small amount of molybdenum and the maintenance of the taining metal to the .iron, andpermitting the resultant alloy to cool, the molybdenum being added in such proportion as to give less than 20% thereof'in the final alloy.

5. The herein described'art of enhancing .the rust-resisting qualities of iron which consists in adding thereto an amount of molybdenum less than 20% and keeping the carbon content below 20%.

In testimony whereof I have signed my name to this specification this 3rd day of March, 1920.

GEORGE H. oH'ARLs, 

